Brake-shoe.



' PATENTED SEPT. 15, 1903. A. L. STR

BRAKE s I APPLICATION fivenfoc W Any 7 UNITED STATES i 'atented September 15, 1901 PATENT OFFICE.

ALFRED L. STREETER, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN BRAKE SHOE & FOUNDRY COMPANY, OF NEW YORK, N. Y., A COR- BRAKE-SHOE.

, SPECIFICATION forming part of Letters Patent N 0. 738,856, dated September 15, 1903.

Application filed March 23, 1903. Serial No. 149,141. (No model.)

To wZZ whom, it may concern.-

Be it known that I, ALFRED L. STEEETEE, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois,have invented certain new and useful Improvements in Brake-Shoes, of which the following is a specification.

My invention relates to the wearing-blocks of brakes such as used on railway-cars, and particularly to the kind of brake'shoe' which is made in two parts intended to be fitted together in the brake-head and commonly known as interlocking shoes.

The objects of my invention are, first, to provide a shoe made of two matching parts, each of which is furnished with a malleable-metal eye or attachingdug; secondly, to provide a two-part shoe each half of which is furnished with a malleable eye and a strengthening-rod embedded in the back of the shoe to avoid the danger of the parts or pieces dropping out of place in case of breakage of the cast shoe; thirdly, to construct a brake-shoe in two parts and form an attaching-lug without the necessity of usinga core for forming the eye in casting; fourthly, to provide a brake-shoe with an attaching-lug formed of two malleable eyes of somewhat resilient structure for easy and accurate fitting upon the brake-head, and to provide a two'part shoe each part of which is securely held independently in place in the brake-head and is provided with a strengthening-back integral with the attaching-eye. These objects, together with other advantages which will hereinafter appear, I attain by means of the construction illustrated in preferred form in the accompanying drawings, wherein- Figure 1 is a section of a brake-shoe made in two parts and showing my strengtheningback and malleable lug supplied thereto. Fig. 2 is a top plan View of half of-the shoe. Fig. 3 is a section of another form of interlocking shoe, illustrating a diiferent mode of attaching the strengthening-back. Fig. 4 is a plan of the same. Figs. 5 and 6 are cross-sections taken through the center of the malleable eye, showing two forms of making the attachinglug. Fig. 7 is a plan view of one-half of a shoe,

- still hold together.

showing the malleable eye of Fig. 6 embedded therein.

The danger of railroad accidents from the breakage of brake-shoes as they get worn thin is increased in the use of the form of shoe which is made in two parts fitted together within the brake-head. It is necessary to provide such shoes with a backing or embedded structure of malleable iron in order that when the shoe cracks the pieces may It is also Very important that the block as a whole shall be very securely attached to the brake-head. Again, in the use of two-part brake-shoes some difficulties arise in getting the component parts of the central attaching-lug of proper size and form to neatly fit in place. Especially is this true where the attachinglug is cast and the eye thereof formed by means of a core in the mold, because this frequently leaves a fin of metal around the core, which must either be ground oif or else interferes with the fitting of the lug into place.

All the above difficulties, as well as the trouble involved in using a core in casting the shoe, I avoid by means of the construction illustrated.

In the form shown in Fig. 1 the blocks 8 9 may be provided on their backs with a malleable iron or steel wire 10, partially or wholly embedded in the cast metal, with downturned ends 12 to secure a good hold in the block, and a loop 11, which forms, with the corre sponding loop of the other block, the attach ing-lug of the shoe. Generally the casting only extends high enough to form a seat for the key, and the wire loop is left bare.

As illustrated in Figs. 3 and 4, the eyes 11, formed by bending of the wire 13, are of the same general form, and the wires may be more securely anchored to the back of the shoe by use of the independent loops 14. These latter are especially useful where it is not de sired to bury the wires 13 very deep, and in this case the downward turn of the wires at their ends may be dispensed with.

In Fig. 5 I have shown another mode of forming the wire loop for the attaching-lug in which the ends of the loop are twisted around each other. When desired, this wire loop may be engaged with a longitudinally-disposed single wire embedded in the block.

Fig. 6 shows another form of wire loop 17 in which the embedded ends are turned outwardly to secure better anchorage. Many other forms will readily suggest themselves. It will be seen that by the use of this pair of exposed wire loops 11 15 17 it will be easy to put the two blocks of the interlocking shoe together in place and that any danger of breakage of the attaching-lug is in alarge measure obviated. Moreover, in the preferred form, as in Fig. 1, the strengtheningframework on the back of the shoe is integral with the attaching-lug and is completely anchored in all parts of the block, so that even .if the block were cracked it could neither upward near the center of the shoe to form an attaching-lug and being partially embedded in the metal of the shoe.

4:. A brake-shoe comprising two independent blocks each of which is provided with a partially-em bedded and partially-exposed malleable-metal eye to form an attaching-lug for the shoe.

5. A brake-shoe comprising two independent blocks each forming half of the shoe and each provided with a partially-exposed wire loop with bent ends embedded in the cast metal of the shoe, the two said loops forming doubled and looped upwardly to form the attaching-lug of the shoe and being provided with anchorages completely embedded at their outer ends and at the base of said loops, substantially as described.

' 7. A block forming half of an interlocking brake-shoe provided with a seating-surface at its end and under the attaching-lug, the attaching-lug being formed of a malleableiron loop only partially embedded in the metal beneath said seating-surface, substantially as described.

8. A two-part brake-shoe each part having a malleable-iron loop to form an attachinglug with its ends upturned and embedded in the cast metal of the shoe, substantially as described.

9. A two-part cast-metal brake-shoe, each part having embedded in its back a malleablemetal bar bent upward and looped to form an attaching-lug for the shoe and its ends bent downward and embedded near the outer end of the shoe, substantially as described.

10. A two-part cast-metal brake-shoe comprising a body having integral attaching-lugs and a wire attaching-eye, only parts of which are embedded in said lugs.

11. A brake-shoe comprising two bodyportions having integral retaining-lugs and each having a wire attaching-eye the bowed or upwardly-bent part of which is bare and the lower part adjacent to the body being embedded in the lugs, substantially as described.

In testimony whereof I have hereunto signed my name in the presence of the two subscribing witnesses.

ALFRED L. STREETER.

Witnesses:

PAUL CARPENTER, EDWARD O. BURNs. 

